Yet another example of how close today's supposed liberals are to libertarians on immigration - or at least how much the libertarian position on immigration serves the interests of the Democratic Party - comes from Dylan Scott of TalkingPointsMemo.

Twice each year, the Koch family conducts strategy meetings with corporate and thought leaders to plan how to advance their "free market" ideology. ThinkProgress has the guest list and program for their June 2010 meeting (in Aspen), and, while immigration isn't mentioned, many of the known attendees are on the wrong side.
I don't normally recommend anything at ThinkProgress, but in this case I'll suggest taking a look at their post and downloading the PDF.
The New York Times has a related report here; from that:
The participants in Aspen dined under the stars at the top of the gondola run on...

Tamar Jacoby has issued the following statement:
We the undersigned applaud the introduction today of Secure America and Orderly Immigration Act... [etc. etc...]
The signatories include:
Lee Culpepper (last mentioned here; works for the National Restaurant Association and is Chairman of the National Immigration Forum)
Jack Kemp
Grover Norquist
Rick Swartz:
And then there's the National Immigration Forum, the umbrella organization for high-immigration political advocacy, which works closely with sympathetic Republicans. But NIF is not like the conventional lobbying coalitions that...

A statement/open letter/mess of lies entitled "A Conservative Statement of Principles on Immigration" appeared in Friday's Wall Street Journal (more about the WSJ here and here).
The WSJ is subscription-only, but a copy is available here:
[America is a nation of immigrants, heart-warming platitudes, etc. etc...]
Conservatives believe in legal immigration.[related folderol deleted]
Conservatives oppose illegal immigration. We believe there is a right way and a wrong way to immigrate to the United States. However, as conservatives we believe that our laws must reflect reality and common sense...